Mosby was a calvary officer from Virginia who fought under Jeb Stuart. He used stealth and surprise to destroy lines of communication and harrass his foes.
After the war he obtained parole from President Grant and held a series of government jobs as well doing legal work for the Southern Pacific Rail Road.
In the last capacity he lived in California and came into contact with young Georgie Patton who later used the calvary tactics of rapid mobility to become probably the most feared American commander in Europe.
Patton used forceful attacks to fix his enemy in place and then moved mobile armor around or through their defense to disrupt cohesive military response.